What to test in Guernsey
Start with a local question. Keep the network, language, and delivery settings separate so the result tells you something useful.
Treat Guernsey as an explicit delivery destination
For a Guernsey checkout test, inspect the country or territory selector before entering the postcode. A form may handle the Channel Islands differently from a UK address. Save the selected territory and resulting delivery options rather than inferring eligibility from an English-language storefront.
Follow the address through the final summary
Use a Guernsey test address you control and trace how the form preserves town, postcode, and country values. Capture the summary before purchase. If the site rewrites the destination or removes a delivery method, that is useful application evidence even when the proxy connection succeeds.
Compare with the UK without relabelling the route
Use the United Kingdom as a control for a Guernsey project while keeping the same requested page and browser state. Record both observed exit labels. A UK result may explain a redirect, but it cannot replace a verified Guernsey observation when the territory itself matters.